Question

我有一个在树莓派上运行的小型python项目。它监控温度，检查和发送电子邮件，并控制PDU。它完全从包含在raspbian中的Thonny IDE运行。但是，当我从命令行运行它时，或者理想情况下在启动时，它会在处理检查电子邮件的一个特定代码段中失败。

我使用pip install在系统上安装了电子邮件模块。然后我意识到这是python中的标准，所以我卸载了它。

这是错误代码。

Traceback (most recent call last):
  File "/home/pi/Documents/Python Files/Temp_Monitor_Project/temp_controller.py", line 122, in <module>
    main()
  File "/home/pi/Documents/Python Files/Temp_Monitor_Project/temp_controller.py", line 104, in main
    check_email_com(state_and_monitoring)
  File "/home/pi/Documents/Python Files/Temp_Monitor_Project/temp_controller.py", line 16, in check_email_com
    command = check_email.check_for_commands()
  File "/home/pi/Documents/Python Files/Temp_Monitor_Project/check_email.py", line 43, in check_for_commands
    command = message.checkMail()
  File "/home/pi/Documents/Python Files/Temp_Monitor_Project/check_email.py", line 20, in checkMail
    email_msg = email.message_from_bytes(data[0][1])
AttributeError: 'module' object has no attribute 'message_from_bytes'

这是它失败的脚本。

import imaplib, struct, time, email, Send_Email

#global sender

class Mail():
    def __init__(self):
        self.user= 'email address'
        self.password= 'password'
        self.M = imaplib.IMAP4_SSL('imap.gmail.com', '993')
        try:
            self.M.login(self.user, self.password)
        except:
            print("mail login failed")

    def checkMail(self):
        self.M.select()
        self.unRead = self.M.search(None, '(SUBJECT "Temp Monitor Command" UnSeen)')
        if len(self.unRead[1][0].split()) > 0:
            status, data = self.M.fetch(self.unRead[1][0], '(RFC822)')
            email_msg = email.message_from_bytes(data[0][1])
            if email_msg.is_multipart():
                for part in email_msg.walk():       
                    if part.get_content_type() == "text/plain":
                        body = part.get_payload(decode=True) 
                        body = body.decode()

                    elif part.get_content_type() == "text/html":
                        continue
            #print(self.M.fetch(self.unRead[1][0], "(BODY[HEADER.FIELDS (FROM)])"))
            return body
        else:
            return -1

Answer 1

我认为问题出在您尝试执行代码的附近环境中。尝试在两种情况下检查已安装的模块。您可以阅读有关如何在执行期间列出已使用模块的here。您还应该检查两种情况下使用的python实例。为此，您可以执行此

import sys 
print(sys.executable)
print(sys.version)

为什么这个python脚本只在从命令行运行时失败？

1 个答案: